<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            background-color: #f00;
            border: 5px solid green;
        }
    </style>
</head>
<body>
<div>页面没有找到</div>
</body>
</html>